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Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period			$ 304,506
Balance at end of period	$ 303,267		303,267
Currency Translation
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(182,961)	$ (172,459)	(172,843)	$ (172,434)
Other comprehensive income (loss)	4,364	1,720	(5,754)	1,695
Balance at end of period	(178,597)	(170,739)	(178,597)	(170,739)
Accumulated Defined Benefit Plans Adjustment | Defined Benefit Pension Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(77,214)	(74,458)	(78,257)	(75,286)
Other comprehensive income (loss)	1,031	817	2,074	1,645
Balance at end of period	(76,183)	(73,641)	(76,183)	(73,641)
Accumulated Defined Benefit Plans Adjustment | OPEB
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(670)	(620)	(590)	(550)
Other comprehensive income (loss)	(71)	(65)	(151)	(135)
Balance at end of period	(741)	(685)	(741)	(685)
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at beginning of period	(260,845)	(247,537)	(251,690)	(248,270)
Other comprehensive income (loss)	5,324	2,472	(3,831)	3,205
Balance at end of period	$ (255,521)	$ (245,065)	$ (255,521)	$ (245,065)

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Amount after tax of other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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